Door opening and closing device

Abstract

Coil springs are incorporated, with a longitudinal direction oriented vertically, into the top and bottom end parts of hinge pieces provided on side surfaces of opposing door panels of a folding door and that connect the doors panels together. A portion of a pin plate is inserted into the coil springs at the top and bottom end parts of the coil springs and attached to the coil springs. The pin plate that is inserted into the top end part of the coil spring incorporated into the top end part of the hinge piece and the pin plate that is inserted into the bottom end part of the coil spring incorporated into the bottom end part of the hinge piece are fixed to the hinge pieces by brackets. The folding door is closed by the restoring force generated by the twisting of the coil springs.

Description

PRIORITY CLAIM[0001]This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2009-141667, filed Jun. 12, 2009, the entire contents of which is incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to a door opening and closing device with a mechanism that connects door panels of a folding door together and automatically closes the door, and particularly relates to a door opening and closing device with excellent durability that can easily be attached or removed from the door panels.BACKGROUND OF THE INVENTION[0003]The space in lavatories of aircraft and the like is severely restricted, so lavatories are required to be as compact as possible. Therefore, doors are folding doors that do not require a large space in which to move. The folding doors mounted on these lavatories have a mechanism that automatically closes an open door in order to ensure safety and to block unpleasant odors (see Japanese Unexamined P...

AI Technical Summary

Benefits of technology

The solution enhances the durability of the door closing mechanism by reducing stress concentration in coil springs, preventing premature damage, and simplifies installation and replacement, ensuring reliable automatic door closure and improved longevity.

Problems solved by technology

The space in lavatories of aircraft and the like is severely restricted, so lavatories are required to be as compact as possible.

As such, when opening or closing the door, stress accumulates around regions where helical wound wires formed at top and bottom ends of the coil springs is stretched straight, and thus the top and bottom ends of the coil springs are easily damaged, which has been a cause of reduced durability.

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